/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.space;

@SuppressWarnings("unchecked")
public class SpaceTap implements SpaceListener {
	LocalSpace ssp;
	LocalSpace dsp;
	Object key;
	Object tapKey;
	long tapTimeout;

	/**
	 * @param sp         space
	 * @param key        key to monitor
	 * @param tapKey     key to use when copying
	 * @param tapTimeout copy timeout in millis
	 */
	public SpaceTap(LocalSpace sp, Object key, Object tapKey, long tapTimeout) {
		this(sp, sp, key, tapKey, tapTimeout);
	}

	/**
	 * @param ssp        source space
	 * @param dsp        destination space
	 * @param key        key to monitor
	 * @param tapKey     key to use when copying
	 * @param tapTimeout copy timeout in millis
	 */
	public SpaceTap(LocalSpace ssp, LocalSpace dsp, Object key, Object tapKey, long tapTimeout) {
		super();
		this.ssp = ssp;
		this.dsp = dsp;
		this.key = key;
		this.tapKey = tapKey;
		this.tapTimeout = tapTimeout;
		if (key.equals(tapKey) && ssp == dsp)
			throw new IllegalArgumentException("Possible deadlock - key equals tap-key within same space");
		ssp.addListener(key, this);
	}

	public void notify(Object key, Object value) {
		dsp.out(tapKey, value, tapTimeout);
	}

	public void close() {
		if (ssp != null) {
			ssp.removeListener(key, this);
			ssp = null;
		}
	}
}

